AQA · Chemistry · 8462
GCSE Chemistry: Production and uses of NPK fertilisers
Using resources · AQA GCSE Chemistry (8462), specification point 4.10.4.2. Cards are generated from the exam board's own specification for "Production and uses of NPK fertilisers", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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Which three elements do NPK fertilisers supply?
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Nitrogen (N), phosphorus (P) and potassium (K).
Why are compounds of nitrogen, phosphorus and potassium used as fertilisers?
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To improve agricultural productivity (crop yields).
Which two types of product is ammonia used to manufacture for fertilisers?
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Ammonium salts and nitric acid.
Potassium chloride, potassium sulfate and phosphate rock are obtained by ?.
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mining
Why can phosphate rock not be used directly as a fertiliser?
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It is insoluble, so plants cannot absorb the phosphate; it must first be treated with acid to make soluble salts.
Which two acids are used industrially to treat phosphate rock into soluble fertiliser salts?
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Nitric acid or sulfuric acid.
What is an NPK fertiliser, in terms of its composition?
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A formulation of various salts containing appropriate percentages of nitrogen, phosphorus and potassium.
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